I think you can use any 3" testpipe/cat and 3" catback...... the DP must be theirs.... (maybe due to the o2 housing?)....

Also I dont think the FMIC matters...aftermarket is recommended.... but dont waste your money on any Intercooler pipes....
(their kit comes with the LICP)

-shahul

 

AMS turbo back utilizes 3 bolt flanges, my APS exhaust was 2 bolt flange... so some people may have to have a muffler shop fab up a test pipe to mate up to your choice of cat back, or buy the complete kit and sell your turbo back

 

really....... I hope my UR testpipe works with their DP

-shahul